Fix copying description also during upgrade

This will add copying the description also
while upgrading from v1alpha1 to v1beta1
for pipeline, task and clustertask

Related to tektoncd/cli#819

pkg/apis/pipeline/v1alpha1/pipeline_conversion.go

@@ -42,6 +42,7 @@ func (source *PipelineSpec) ConvertTo(ctx context.Context, sink *v1beta1.Pipelin
 	sink.Resources = source.Resources
 	sink.Params = source.Params
 	sink.Workspaces = source.Workspaces
+	sink.Description = source.Description
 	if len(source.Tasks) > 0 {
 		sink.Tasks = make([]v1beta1.PipelineTask, len(source.Tasks))
 		for i := range source.Tasks {
@@ -86,6 +87,7 @@ func (sink *PipelineSpec) ConvertFrom(ctx context.Context, source v1beta1.Pipeli
 	sink.Resources = source.Resources
 	sink.Params = source.Params
 	sink.Workspaces = source.Workspaces
+	sink.Description = source.Description
 	if len(source.Tasks) > 0 {
 		sink.Tasks = make([]PipelineTask, len(source.Tasks))
 		for i := range source.Tasks {

pkg/apis/pipeline/v1alpha1/task_conversion.go

@@ -47,6 +47,7 @@ func (source *TaskSpec) ConvertTo(ctx context.Context, sink *v1beta1.TaskSpec) e
 	sink.Results = source.Results
 	sink.Resources = source.Resources
 	sink.Params = source.Params
+	sink.Description = source.Description
 	if source.Inputs != nil {
 		if len(source.Inputs.Params) > 0 && len(source.Params) > 0 {
 			// This shouldn't happen as it shouldn't pass validation
@@ -120,5 +121,6 @@ func (sink *TaskSpec) ConvertFrom(ctx context.Context, source *v1beta1.TaskSpec)
 	sink.Results = source.Results
 	sink.Params = source.Params
 	sink.Resources = source.Resources
+	sink.Description = source.Description
 	return nil
 }